[BUG]use @callback failed

[YDS854394028]

Description

"When I use the @callback decorator to pass into Task or Crew, it results in an error."

Steps to Reproduce

@callback
def callback_function(self,output: str):
# Do something after the task is completed
# Example: Send an email to the manager
print(f"""
Task completed!
Task: {output.description}
Output: {output.raw}
""")

@task
def research_task(self) -> Task:
return Task(
config=self.tasks_config['research_task'],
callback=self.callback_function
)

@crew
def crew(self) -> Crew:
"""Creates the Crewaiexample crew"""
# To learn how to add knowledge sources to your crew, check out the documentation:
# https://docs.crewai.com/concepts/knowledge#what-is-knowledge

return Crew(
   agents=self.agents, # Automatically created by the @agent decorator
   #可以不用注解直接传 tasks=[self.research_task(),self.reporting_task()], # Automatically created by the @task decorator
   tasks=self.tasks,
   process=Process.sequential,
   verbose=True,
   cache=True,
   task_callback=self.callback_function
   # process=Process.hierarchical, # In case you wanna use that instead https://docs.crewai.com/how-to/Hierarchical/
)

Expected behavior

in document no page used the @callback

Screenshots/Code snippets

Operating System

Ubuntu 20.04

Python Version

3.10

crewAI Version

0.9

crewAI Tools Version

0.9

Virtual Environment

Venv

Evidence

no

Possible Solution

no

Additional context

no